Influence of Initial Preform Aspect Ratios on the Densification Mechanism of Sintered Preforms of Iron and AISI 3115 P/M Steel during Hot Upset Forging
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2014, Vol 4, Issue 8
Abstract
Hot upset forging experiments were carried out on sintered Iron and AISI 3115 Powder Metallurgy (P/M) steel preforms at 1120˚±10˚C which were sintered at the same temperature for a period of sixty minutes. Present investigation, therefore, pertains to evaluate the effect of initial preform geometry on how the densification mechanism/s operate/s during hot upsetting mode. Preforms of initial aspect ratios of 0.6, 0.85 and 1.05 respectively were prepared on a 1.0 MN capacity Universal Testing Machine from Iron as well as from AISI 3115 composition powder blend using suitable die punch and bottom insert assembly in the pressure ranges of 537±10M Pa; 557±10M Pa; and 578±10MPa respectively. With the control of pressure and powder weights, the initial compact densities were maintained in the range of 0.91±0.01 of theoretical density. All compacts were coated with a thin film by using indigenously developed ceramic coating twice and at each time they were dried for a period of twelve hours under an ambient conditions. Ceramic coated compacts were sintered in an electric muffle furnace for a period of sixty minutes at 1120˚±10˚C. All sintered compacts except one from each aspect ratios were hot upset forged to different height strains and suitable plots were drawn between fractional theoretical density and the true height strains, true diameter strain and the true height strains, Poisson’s ratio and the fractional theoretical density, the fractional theoretical density and the bulging ratio to establish empirical relations in the above said parameters. Analysis of the experimental and the calculated parameters along with the various plots have yielded several empirical relationships of practical as well as of theoretical importance.
Authors and Affiliations
Rajesh Reddy Koppula , K. S. Pandey
Keywords
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